Mike Freeman of CBS Sports recently uncovered several instances of lockout rules violations: Players talking with coaches after player-led workouts in which coaches are supposed to have no participation. Coaches sending plays via Skype that players then use in workouts. Position coaches (head coaches seem to be keeping their distance, Freeman reports) watching game film with players at the homes of the players. Coaches getting updates on player injuries and surgeries. Direct messages back and forth between coaches and players via Twitter.
And Pro Football Weekly recently reported that the undrafted free agents represented by six different agents have been illegally contacted by NFL teams.
The NFL has released no statement regarding Freeman's article, though we're pretty sure we'll eventually hear the basic lip service about such contact being illegal per the current labor dispute, and that these points will be looked into. Teams have released the basic statements regarding tampering that you'd imagine after the UDFA findings were revealed.